14.3 Flashcards
What are 3 main engine control?
- engine start controls
- forward thrust controls
- reverse thrust controls
is used to switch fuel on and off and to switch ignition on during engine start.
start lever
is used to control the thrust of an engine between idle and take-off thrust.
forward thrust lever
When it is activated the deflector doors are deployed and the airflow is deflected to give reverse thrust.
Reverse thrust lever
are used to control the engine start sequence,
master switches on the engine start panel
help to set the required thrust
control levers
are used with the control levers to give reverse thrust.
reverse latching levers
low pressure fuel shut-off valve is usually an _____
electric motor driven valve
It is also called fire shut-off valve, therefore also controlled by engine fire switch.
LP fuel valve control
Which position of the reverse thrust lever is used to activate the reverser?
Reverse Idle Position
Which position of the reverse thrust lever is used to stow the reverser?
Normal Position
Which position of the reverse thrust lever is used to increase engine power?
Full Reverse Throttle Position
This component converts mechanical signal to a voltage signal that is transmitted to the engine control unit.
Resolver
How many resistors do the ignition exciter have?
Two
The position of this low pressure fuel shut-off valve is indicated by the fuel valve closed light. This light illuminates when the valve is in what position.
Closed
This are electrical components which convert the angular deflection of the input lever to an electrical signal.
Resolver
The amber color of the valve symbol on the ECAM display indicates what?
Emergency closure of LP fuel Valve
They are located behind the fuel metering valve in the fuel control unit.
Electrical HP Fuel Valve
The spring-loaded valve is usually called
Pressurizing Valve
The high pressure fuel and spring force keeps the pressurizing valve in the closed position if the start lever is at what position?
Cut-off
In the HP valve with a standard single coil solenoid, the solenoid is de-energized when the HP shut off valve is in what position
Open
Solenoid Energized = HP shut off valve closed
Solenoid De-energized = HP shut off valve open
The solenoid is de-energized and the servo valve moves down when the start lever is at what position?
Idle
These solenoids at the HP valve need electrical power to close the valve and to open the valve.
Dual coil solenoid
Aircraft manufacturers added this to prevent the valves from moving to a closed position even if the start lever is in idle position when there is a short circuit.
Protection Circuit
It is activated by the plunger of the pressurizing valve. When activated it de-energizes the protection relay and this disconnects the electrical power from the solenoid. This makes sure that the valve cannot move by mistake.
Limit Switch
The main positions of these levers are idle and takeoff thrust.
Forward Thrust Levers
They are also called the throttles.
Forward thrust lever
Which of the following is correct?
At the drum below the trust levers, the forward thrust lever rotates the drum counter clockwise and the reverse thrust lever rotates the drum clockwise.
It is used to accelerate and decelerate engine but cannot be used to shut down engine
Forward Thrust Control
The Thrust control system transmit the ___ to the fuel control unit via control rods, cables, and drums and puley and flexible controls such as push-pull cables.
Engine Start Signal
To which component does the power lever transmits the thrust lever signal to?
Fuel Control Unit (FCU)
When the Thrust levers are in idle, the power lever is in what position?
Mid
Which of the following is true?
If you move the thrust levers forward, the power lever moves up.
Where can racks and pinions be found?
thrust control drum, engine pylon, and FCU
The ____movement of the rack is transformed into a ____ movement by the pinion.
circular; radial
It ensures that the internal friction must be strong enough to prevent the throttles moving due to vibration but should be small enough to move the throttles easily.
Friction Brake
The ___mechanism receives signals from the autothrottle computer and uses an electrical servo motor to move the thrust lever.
Autothrottle Servo
It ensure that the autothrottle servo motor can be disconnected from the mechanical control system.
Integral Friction
Microswitches are used for the following warnings and controls which depend on the lever position except
Engine Fire Warning
Which adjustment of the engine thrust control systems is done separately
controls between the pylon and the fuel control unit
The adjustment between the cockpit and the pylon is usually done with the thrust levers in which position.
Idle
What is necessary after adjustment of the thrust control system to make sure that thrust control levers can be moved over the full range between idle and full forward thrust adn between idle and full reverse thrust.
Travel check
Its taks are to activate the thrust reverser, increase engine power, and block the reverse thrust lever while the reverser moves from the stowed to the deployed position.
Reverse Thrust Controls
It is the mechanical linkage to prevent the pilot from increasing engine power until the reverser is fully deployed.
Throttle Interlock System
When the reverse thrust control lever is moved to reverse idle, the thrust control pinion rotates until the lower roller contacts the cam of the reverser feedback cam.
counter-clockwise
When the reverser____ the reverse feedback mechanism rotates the reverser feedback cam clockwise.
deploys
Ensures that the forward thrust lever and the reverse thrust lever can not be activated at the same time.
thrust lever lock system
What happens when the throttle control lever is pushed forward in the lever lock system?
it locks the two rollers of the rocker arm
In a Electrical Thrust Control, how many thrust control signals are sent from each control lever to the associated electronic control unit at the engine.
two
An _____is used to simulate a higher resistance in the mechanical transmission system.
artificial feel mechanism
In fly-by-wire Airbus aircraft, how is a new power setting request handled without an autothrottle servo motor?
By sending the request directly to the
FADEC computers
What range of positions can the forward thrust control lever be set to?
Idle to full forward thrust
How does the number of mechanical parts in a thrust control system affect rig points?
More parts mean more rig points
What does the reverse idle position of the reverse thrust lever do?
Activates the reverser
Which system uses control switches for functions like take-off warning and thrust reverser activation?
Electrical reverse thrust control system
Why might some aircraft do not have a throttle interlock system?
The FADEC can monitor reverser deployment and adjust fuel flow
What dangerous situation can occur if a reverser fails to deploy on an outer engine of a 4-engine aircraft?
Strong yaw momentum to runway departure
How are the reverser control levers protected on some aircraft with FADEC?
By individual electromechanical
interlock actuators
How do the FADEC systems of the outer engines communicate on the A340?
They lock the reverse levers until both outer reversers are deployed
On the A320, it releases the throttle control lever so that it can be pulled further aft out of the idle position for full reverse power.
reverse latching lever
Ignition is also necessary for the engine when external conditions can lead to a flame-out of the combustion
Continuous ignition function
